Sweep: orientation, twist and end scale (#1269)

Part of #771 and #772. solid.sweep and surface.sweep take orientation (perpendicular, parallel or a direction), twist (up to 4 turns) and end scale (0.01 to 100), applied about the profile's normal through the path's start; default options run the old sweep, so existing sweeps are unchanged. New fields are optional, left out when unset and noted under format 21; twist and scale are model parameters. Both sweep dialogs get Orientation, Twist and End Scale rows; labels in every catalog. Checked on main + this branch: cargo check --workspace, kernel/engine/UI sweep tests, the doc suite and the robustness goldens.

crates/ui-egui/src/lib.rs

@@ -32,6 +32,7 @@ pub mod dialogs_plastic;
 pub mod dialogs_save_mesh;
 pub mod dialogs_sheet;
 pub mod dialogs_surface;
+pub mod dialogs_sweep;
 pub mod dim_view;
 #[cfg(test)]
 mod dimension_create_ui_tests;
@@ -141,6 +142,8 @@ pub mod smart_extrude;
 #[cfg(test)]
 mod smart_extrude_ui_tests;
 pub mod stand_up;
+#[cfg(test)]
+mod sweep_dialog_tests;
 pub mod theme;
 #[cfg(test)]
 mod thin_extrude_tests;